package com.atguigu.flink0624.chapter07.state;

import com.atguigu.flink0624.bean.WaterSensor;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.functions.ReduceFunction;
import org.apache.flink.api.common.state.ReducingState;
import org.apache.flink.api.common.state.ReducingStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.time.Duration;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/11/15 15:25
 */
public class Flink06_KeyedState_Reduce {
    
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 2000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
        
        // 返回值就是每条数据的事件时间
        env
            .socketTextStream("hadoop162", 9999)
            .map(line -> {
                String[] data = line.split(",");
                return new WaterSensor(data[0], Long.valueOf(data[1]), Integer.valueOf(data[2]));
            })
            .assignTimestampsAndWatermarks(
                WatermarkStrategy
                    .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                    .withTimestampAssigner((element, ts) -> element.getTs())
            )
            .keyBy(WaterSensor::getId)
            .process(new KeyedProcessFunction<String, WaterSensor, String>() {
                
                private ReducingState<WaterSensor> vcSumState;
                
                @Override
                public void open(Configuration parameters) throws Exception {
                    vcSumState = getRuntimeContext()
                        .getReducingState(new ReducingStateDescriptor<WaterSensor>(
                            "vcSumState",
                            new ReduceFunction<WaterSensor>() {
                                @Override
                                public WaterSensor reduce(WaterSensor value1,
                                                          WaterSensor value2) throws Exception {
                                    value1.setVc(value1.getVc() + value2.getVc());
                                    return value1;
                                }
                            },
                            WaterSensor.class
                        ));
                }
                
                @Override
                public void processElement(WaterSensor value,
                                           Context ctx,
                                           Collector<String> out) throws Exception {
                    vcSumState.add(value);
                    
                    WaterSensor ws = vcSumState.get();
                    out.collect(ws.toString());
                    
                }
            })
            .print();
        
        env.execute();
        
    }
}
